<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>
<body>
    <script>
        function fun(){
            var num = 100;
            function foo(){
                console.log('打印:'+num);
                
            }
            return foo;
        }
        fun()();
        function fun1(){
            var num = 20;
            function foo1(newNum){
                num = newNum;
                console.log(num);
                
            }
            function getNum(){
                return num;
            }
            return [foo1,getNum];
        }
        var fn3 = fun1();
        console.log(fn3[1]());
        fn3[0](150);
        console.log(fn3[1]());
        
    </script>
</body>
</html>